Mandrel-polishing machine



June 24, 1930. w. c. STEVENS 1,768,339

MA DREL POLISHI'NG MACHIN Filed Jane 17, 1926 s Sheejgs-Sheet 1 INVENTOR. WALL/m7 C STt'VI/YS .A TTOR'NEY.

June 24, 1930. w. c. STEVENS v MANDREL POLISHING MACHINE 3 Sheets-Sheet 2 Filed June 17, 1926 QM. MN

I INVENTOR. Mum/7 C STEVZ/VS.

A TTORN E Y.

June 24, I930 w. c. STEVENS v 1,768,339

MANDREL POLI SHING 'MACHiNE v r Filed June 17, 1926 3 SheetsSheet 3 IHII.

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INVENTOR. MAM/W C SIB .516

Z5 ATTORNEY. 24 v Patented June 24, 1930- NITED STATS t :QFF'ICE WILLIAM C. STEVENS, OF AKRON, OHIO, ASSIGNOR' TO THE FIRES' IONF. TIRE AND RUBBER COMPANY, OF AKRON, OHIO, A. CORPORATION OF OHIO MANDREL-POLISHING MACHINE Application filed J'une 17,

factured by rolling or applying vulcanizable rubber to poles or mandrels about nine or more feet long, and vulcanizing the tubes on the mandrels in heaters. Subsequent to the vulcanization the tubes are reversely stripped from the mandrels and completed by a splicing operation. Accordingly, it is desirable to maintain the surface of the mandrel clean and smooth so that the out? side of thefinished tube will be smooth andnon-pitted, The vulcanizingj action forms deposits on the mandrels which renders nec-' essary occasional polishing thereof to keep them in the desired conditlon.

It is the object of the present invention to provide-an eflective device for thorough- 1y polishing poles or mandrels as described above. The device is capable of general application to other uses than the specific one herein disclosed so that the accompanying drawings and the following description thereof are intended for purposes 6' illustration, the invention in its broadest aspects not being limited to the specific use-set forth.

Of the accompanying drawings:

Figure 1 is a front elevation, partly broken away, of a machine embodying the invention;

' Figure '2 is-a plan, partly broken away, thereof;

Figure 3 is Figure 4 is a of the machine;

Figure 5 is a section on line 55 of Fig. ure 1; and

Figure 6 is a section on line 66 of Figure 1.

Referring to the drawings 10 represents a right end elevation thereof; part plan of the right end .;a suitable supporting table on which is mounted, at the left end, brackets 11 and 12 in which is slidably mounted a rod 13 carrying a center 14 journaled thereon for supporting one end of a mandrel, indicated'at M. Tensile springs 15, 15 normally urge 4 a gear 42 on shaft 31 meshed with f pivote 1926. Serial No. 116,576.

center 14 to the right, these springs being connected to bracket 12 and a crosshead 16 on rod 13. ,Center 14 maybe manually,

shifted by means of a lever 18 connected to a bracket 19 shiftable into engagement with a collar 17 fixed on rod 13, lever 18 being pivoted at 19 on table 10.

To support the other end of mandrel M' and to rotate the same, there is arranged a chuck 20 of hollow, conical shape into which chuck 20 bein' secured on a shaft 21 jour naled and shi able in bearing brackets 22 and 23 mounted on table 10 and keyed or r splined to a gear 24 held on shaft 21 between brackets 22 and 23 and through which shaft 21 maybe driven while being shifted back and forth in bearings 22 and 23.

.oneend of the mandrel M may be inserted,

Operable against the surface of mandrel M are sets of abrasive belts 25, 25 which areeach trained over pulleys 26 and 27 mounted; on brackets 28 on the rear of table 10 and which may be driven in pairs by gears 29.

secured to pairs of pulleys 26 and meshed with driven gears 30 secured on a shaft 31 journaled in bearings on bracketsr28 and 23. The lower pulleys 27 are preferably carried by arms 32, pivoted on brackets 28 r at 33, so that belts 25 are yieldably tensioned by the weight, of pulleys 27 and arms 32.

Shaft 31 is adapted to be driven by a sprock et 34 over which is trained a chain 35 dri v; en by a sprocket 36 on the shaft of a motor 37. Sprocket 34 is rotatable on shaft 31 and a clutch 38 is arranged toconnect sprocket- 34 to the shaft 31 at will, clutch 38 being operable by a lever 39 pivoted on bracket 22 and operable from any point along the machine by a. rod 40 connected thereto and shiftable in bearing brackets 41, 41 supported on table 10.

Rotation and shifting or reciprocation of mandrel M may be effected, respectively, by

- 52 journaled in a bearing llS 49. It will also be apparent ing the mandrel in the chuck and on center' 14, the forward a follower .47 recipi'ocable on table-1O and having a roller 48 thereon engaged-with a heart-shapedfcam 49 arranged to be rotated by a worm gear meshed with a worm 51 on shaft 31,-worm gear 50 and cam 49 being secured on a shaft 53 on the right end of bracket 28.

In operation, a mandrel M isinserted in the machine, clutch 38being disengaged, one

end of the mandrel being inserted in chuck 20, and center 14 being shifted by lever 18 against the-action of springs 15 to permit mounting thereon.-

It will now a pear that springs 15 through mandrel 4 toggle arm 43 and follower 47 urge follower roller 48 against cam that in mount- I reaches of belts 25 are depressed inwardly by the mandrel, pulleys 27 yielding upwardly to permit this action and also serving-to hold the belts 25 against mandrel M with considerable pres-" sure.

- shifting mandrel Motor 37 may be continuousl Clutch 38 is then-engaged by shifting rod 40, thus driving shaft 31 which, in turn,

The machine is now ready for operation. drlven.

drives mandrel M and belts 25 in opposite directions at their engaged surfaces and also M longitudinally to and fro so that its entire surface will be sub- Springs center toward the chuck, abrasive belts opandcen'ter, each belt belts.

jected to the action of belts 25, the shifting movement being imparted to the mandrel through worm 51, worm gear 50, cam 49, toggle ar'm 43-and chuck 20, follower roller 48 being held against cam 49 by springs 15 throughout the shifting of the mandrel M.

drels in the chuck and on the center; as will be understood. 1

Modifications of the invention may be resorted to without departing from the spirit' thereof or the scope of the appended claim.

What is claimed is:

Apparatus for polishing poles, comprisa.

ing a shiftably mounted chuck, a shiftably mounted center, yielding means urging the erableiaga inst a pole supported in the chuck being mounted on pulleys one of which is-yieldable toward and from the other-to tension the belt and urge it against the pole, means for rotating the chuck to drive the polevand for driving the belts in opposite lineal directions to the pole,

and means for shifting the chuck and center against said yielding means to shift the polelongitudinally' to and fro relative to the WILLIAM G. STEVENS.

50 connected thereto and the other end of the mandrel 15 also serve to retain the man- 

